“I want to speak to Daisy alone,” he insisted. “She’s all excited now ——”

Gatsby still hasn’t abandoned hope yet, that just isn’t the way things work with him. He feels like Daisy is just overwhelmed by the moment and doesn’t know what to decide, which is partly true. But she has also made it pretty clear that she won’t say she never loved Tom because its not true. This also continues the idea that Gatsby feels like he can decide what Daisy wants for her, without even considering her opinion.